IGS-NT Communication Guide
113
#3
The appropriate argument must be written before writing of the command code, because immediately after the
command code has been written the command is executed. For MODBUS-RTU the argument and command
code can be written at once, in a multiple registers write using MODBUS function 16 (3 registers). As the
argument has lower register address than command, the required sequence is maintained. However, for
MODBUS/TCP the argument and function code must be written separately, the argument first, then the function
code. The argument must be written using MODBUS function 16 (2 registers) and then the command code
using MODBUS function 6 or 16 (1 register). In MODBUS/TCP It is not allowed to write both argument and
command code as one block using function 16. See List of commands and modbus communication examples.
#4
Before entering the password for writing it is necessary to define user identification number. It is recommended
to enter user identification number and password simultaneously. Entered password stays valid 5 minutes after
the last successful writing.
#5
The latest record has index 0, older record has index -1, next record has index -2, …
#6
It is possible to read and write only in case that history reading is not locked by another terminal. Second
necessary condition is to previously write the index.
#7
Implicitly = 0.
#8
„Values multipacket“contains values that are currently configured in the history record.
6 back to Communication
7.6 Replacing InternetBridge-NT
7.6.1 Sites with "NT" family controllers
The CAN module InternetBridge-NT was designed to provide ethernet or cellular connectivity for InteliGen-NT,
InteliSys-NT, InteliSys-Gas controllers and it’s derivatives. The typical topology of InternetBridge connection
was as follows:
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